<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form>
    <!--下拉菜单-->
    <label>
        <span>学历</span>
        <select name="学历">
            <optgroup label="低学历组">
                <option value="1">小学</option>
                <option value="2">初中</option>
                <option value="3">高中</option>
            </optgroup>
            <optgroup label="高学历组">
                <option value="4">大学</option>
                <option value="5">研究所</option>
                <option value="6">院士</option>
            </optgroup>
            <optgroup label="nt组">
                <option value="nt">刘广</option>
            </optgroup>

        </select>
    </label>
    <button type="submit">提交</button>
</form>
</body>
</html>